add panel.resize CLI verb (T-119)

The keyboard half of panel resizing landed in T-111 (arrow-key
splitters); this completes D-6 user/Claude parity with a CLI verb now
that T-99's IPC dispatch path exists. `clide panel resize <slot> --to N`
sets an absolute pixel size, `--by N` nudges relative to current, and
the reserved `editor` slot drives the editor/bottom-panel split ratio.

The handler lives in panel_commands.dart and stays Flutter-free (so
test/daemon/ keeps running under `dart test`) by talking to an abstract
PanelResizer; the kernel bridge in panel_resizer_kernel.dart wraps
LayoutArrangement and reuses T-111's bumpedSlotSize so the CLI's
relative deltas honour the same right-edge sign-flip as the drag/arrow
handlers. Arguments are lifted from both the direct call shape and the
argv-translator's positional/flags shape pending the typed schema in
T-120. The daemonClientFactory now receives the LayoutArrangement so
the dispatcher can reach it.

Co-Authored-By: Claude <noreply@anthropic.com>

lib/kernel/src/facade.dart

@@ -106,7 +106,7 @@ class KernelServices {
     Locale? initialLocale,
     List<Locale> availableLocales = const [Locale('en', 'US')],
     String? socketPath,
-    DaemonClient Function(Logger, DaemonBus)? daemonClientFactory,
+    DaemonClient Function(Logger, DaemonBus, LayoutArrangement)? daemonClientFactory,
     DaemonClient? isolateClient,
     bool autoStartDaemonClient = true,
     Toolchain? toolchain,
@@ -164,7 +164,7 @@ class KernelServices {
     );
     final ipc = isolateClient ??
         (daemonClientFactory != null
-            ? daemonClientFactory(log, events)
+            ? daemonClientFactory(log, events, arrangement)
             : DaemonClient(
                 // Legacy socket-client fallback — kept until T-127
                 // replaces it with the in-process socket loopback.